I never knock MPC, although I've sold and let a lot of it go over the years just because I can only own and store so much.
Think of the advantages...
More road names and colorful locomotives and rolling stock
Smoother running, longer trains with the Delran trucks
Some new rolling stock and locomotive designs--HiCubes, U36Bs, SD40s, etc.
Great for those with nostalgia for the railroading of the 1970s
Cheaper to buy today
My first MPC "crush" was the Chessie NW-2 switcher. Parents couldn't find it, so I got the PRR NW-2 as a birthday present instead. Eventually got the Chessie, still have the PRR.